Tuesday, January 22, 2013

Electronic Circuit Schematic DC Motor Driver using L293D Dual H-Bridge

Robometricschool. - As urgent part, when we want to design robot, driver DC motor can be designed using transistor, FET, and also using Integrated Circuit. One of IC that used to make DC motor driver is L293D as dual H-Bridge DC motor driver

We can use L293D as dc motor driver because we know about L293D datasheet. We know that L293D is L293D is a dual H-Bridge motor driver that consist of two dc motor driver. So with one IC we can interface two DC motors which can be controlled in both clockwise and counter clockwise direction and if you have motor with fix direction of motion the we can make use of all the four I/Os to connect up to four DC motors.  

L293D has output current of 600mA and peak output current of 1.2A per channel. Moreover for protection of circuit from back EMF output diodes are included within the IC L293D. The output supply (VCC2) has a wide range from 4.5V to 36V, which has made L293D a best choice for DC motor driver. To know more physic of IC L293D you can see figure 1 bellow:

Figure 1. L293D Physically

Electronic Schematic of DC Motor Driver using L293D

Figure 2. Schematic of DC Driver Motor using L293D Dual H-Bridge

Electronic Circuit Performance

According electronic schematic of DC driver motor using L293D in figure 2, we can use it to control two DC motor continuously. We can control DC motor one to rotate clock wise and DC motor two to rotate anti clock wise. We also can control all motor to rotate clock wise, anti click wise, or stop all. We can control it with give control in input of L293D. You can use guidance like in figure 3 bellow:

Figure 3. Truth Table to Control L293D DC Motor Driver
From figure 3 above, we can make motor rotate clock wise when in input we give 1 logic in A and 0 logic in B. Also we can make motor rotate anti clock wise when input we give 0 logic in A and 1 logic in B.

We can stop all motor with give in all input 1 logic. Attention you don't give in all input with 0 logic, because it can make L293D error or damage like burn or shot circuit. So careful when you set it. 

In implementation, we can use circuit schematic of DC motor driver using L293D to make driver robot. (Her)


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